US3949970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixer
Assignee: GEBRS TER BRAAK BV
•
Filing: 1974-01-02
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Granted: 1976-04-13
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Expires: 1994-01-02
Abstract
Abstract As in-line mixer for fluids, comprising an elongated open-ended, hollow tube and stationarily positioned therein two or more elongated, helically twisted and interengaging strips which are tightly enclosed by the tube.
Inventors
- 👤 Johannes Gerardus ter Braak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:33
CPC Classifications
F; F28; F28F; F28F13/00; F28F13/06; F28F13/12; B; B01; B01F; B01F25/00; B01F25/40; B01F25/42; B01F25/43; B01F25/431; B01F25/4314; F28D; F28D21/00; F28D2021/0019; F28D2021/0052
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
152 words
Apparatus for mixing two or more fluids to provide extensive mixing and kneading which leads to the formation of a homogeneous mixture in a relatively short length of the apparatus while creating only a small pressure drop, comprising in combination: an elongate casing defining a through-bore of substantially uniform cross-section throughout for at least a major extent thereof; at least one pair of helically twisted strips in which one strip is twisted in right-hand direction whereas the other strip is twisted in left-hand direction, said strips being disposed in side-by-side nested and interfitted relation whereby to define fluid flow paths which periodically merge and then separate along the length of said strips; said strips being housed within said casing within the section thereof which is of substantially uniform cross-section and said casing tightly enclosing said strips whereby to confine said fluid flow paths and enhance intermingling and mixing of fluids passing therethrough.
Claim 2
Dependent Claim
152 words
Apparatus for mixing two or more fluids to provide extensive mixing and kneading which leads to the formation of a homogeneous mixture in a relatively short length of the apparatus while creating only a small pressure drop, comprising in combination: an elongate casing defining a through-bore of substantially uniform cross-section throughout for at least a major extent thereof; at least one pair of helically twisted strips in which one strip is twisted in right-hand direction whereas the other strip is twisted in left-hand direction, said strips being disposed in side-by-side nested and interfitted relation whereby to define fluid flow paths which periodically merge and then separate along the length of said strips; said strips being housed within said casing within the section thereof which is of substantially uniform cross-section and said casing tightly enclosing said strips whereby to confine said fluid flow paths and enhance intermingling and mixing of fluids passing therethrough.
Claim 3
Dependent Claim
13 words
Apparatus as defined in claim 1 wherein said through-bore is of 8-shaped cross-section.
Claim 4
Dependent Claim
19 words
Apparatus as defined in claim 2 wherein the leading edges of said strips are disposed normal to each other.
Claim 5
Dependent Claim
29 words
Apparatus as defined in claim 1 wherein there are two pairs of oppositely twisted strips, each pair being nested and interfitted and the two pairs being in side-by-side grouping.
Claim 6
Dependent Claim
15 words
Apparatus as defined in claim 4 wherein said through-bore is of rosette configuration in cross-section.
Claim 7
Dependent Claim
22 words
Apparatus as defined in claim 5 wherein the leading edges of the strips of each pair are disposed normal to each other.
References Cited (Backward Citations)
US1874002A
Cited
US2254587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |